/* roulang page: index */
/* ----- 设计变量与基础重置 ----- */
    :root {
      --primary-dark: #1A1A1A;
      --accent-gold: #D4AF37;
      --accent-red: #E63946;
      --bg-warm: #F5F5F0;
      --text-body: #2D2D2D;
      --text-light: #FFFFFF;
      --text-muted: #757575;
      --border-light: rgba(0,0,0,0.06);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 40px rgba(0,0,0,0.08);
      --radius-lg: 12px;
      --radius-sm: 8px;
      --radius-pill: 50px;
      --font-serif: 'Noto Serif SC', serif;
      --font-sans: 'Inter', 'PingFang SC', system-ui, -apple-system, sans-serif;
      --transition: all 0.25s ease;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: #FFFFFF;
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    button, input {
      font-family: inherit;
    }

    /* 覆盖 Foundation 默认的一些样式，使其更符合高端设计 */
    .grid-container {
      max-width: 1200px;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      font-weight: 700;
      line-height: 1.2;
    }

    /* ----- 导航栏 (搜索主导 + 毛玻璃) ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 80px;
      background: rgba(255,255,255,0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 10px rgba(0,0,0,0.02);
      z-index: 100;
      transition: box-shadow 0.3s ease, background 0.3s ease;
      display: flex;
      align-items: center;
    }

    .site-header.scrolled {
      background: rgba(255,255,255,0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
      height: 100%;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background-color: var(--accent-red);
      transform: rotate(45deg);
      border-radius: 3px;
    }

    .logo-text {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-dark);
      letter-spacing: 1px;
    }

    .search-wrapper {
      position: relative;
      max-width: 380px;
      width: 100%;
      margin: 0 1.5rem;
    }

    .search-input {
      width: 100%;
      height: 46px;
      background: rgba(245,245,240,0.7);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-pill);
      padding: 0 20px 0 48px;
      font-size: 0.95rem;
      color: var(--text-body);
      outline: none;
      transition: var(--transition);
      backdrop-filter: blur(4px);
    }

    .search-input:focus {
      background: #FFFFFF;
      border-color: var(--accent-gold);
      box-shadow: 0 0 0 3px rgba(212,175,55,0.15);
    }

    .search-icon {
      position: absolute;
      left: 20px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--text-muted);
      font-size: 1rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 1.8rem;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-body);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }

    .nav-links a {
      transition: color 0.2s;
      position: relative;
    }

    .nav-links a:hover {
      color: var(--accent-gold);
    }

    .cta-btn {
      background: var(--accent-gold);
      color: var(--primary-dark) !important;
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 0.9rem;
      letter-spacing: 0.5px;
      transition: var(--transition);
      box-shadow: 0 4px 10px rgba(212,175,55,0.2);
      margin-left: 0.8rem;
    }

    .cta-btn:hover {
      background: #e6c468;
      box-shadow: 0 6px 18px rgba(212,175,55,0.3);
      transform: translateY(-1px);
    }

    /* 移动端汉堡菜单 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-dark);
      cursor: pointer;
    }

    @media (max-width: 1024px) {
      .search-wrapper {
        margin: 0 1rem;
      }
      .nav-links {
        gap: 1.2rem;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        align-items: flex-start;
      }
      .nav-links.active {
        display: flex;
      }
      .cta-btn {
        margin-left: 0;
      }
    }

    /* ----- Hero 首屏 ----- */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #FAFAF8 0%, #F0EDE4 100%);
      padding-top: 100px;
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 3rem;
      width: 100%;
      flex-wrap: wrap;
    }

    .hero-left {
      flex: 1 1 500px;
    }

    .hero-title {
      font-size: clamp(3rem, 6vw, 5rem);
      color: var(--primary-dark);
      margin-bottom: 1.5rem;
      letter-spacing: 1px;
    }

    .hero-sub {
      font-size: 1.25rem;
      color: #4A4A4A;
      margin-bottom: 2.5rem;
      line-height: 1.6;
      max-width: 480px;
    }

    .hero-right {
      flex: 1 1 400px;
      position: relative;
      display: flex;
      justify-content: center;
    }

    .hero-img-stack {
      position: relative;
      width: 100%;
      max-width: 450px;
      animation: floatAnim 6s ease-in-out infinite;
    }

    .hero-img-stack img {
      border-radius: 24px;
      box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
      border: 1px solid rgba(255,255,255,0.6);
    }

    @keyframes floatAnim {
      0% { transform: translateY(0); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0); }
    }

    .scroll-hint {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      font-size: 1.5rem;
      color: var(--accent-gold);
      animation: bounce 2s infinite;
    }

    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% { transform: translateY(0) translateX(-50%); }
      40% { transform: translateY(-10px) translateX(-50%); }
      60% { transform: translateY(-5px) translateX(-50%); }
    }

    /* ----- Bento Grid 功能分组 ----- */
    #features {
      padding: 100px 0;
      background: #FFFFFF;
    }

    .section-title {
      text-align: center;
      font-size: 2.5rem;
      margin-bottom: 3rem;
      color: var(--primary-dark);
    }

    .bento-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      grid-auto-rows: 240px;
      gap: 20px;
    }

    .bento-card {
      background: var(--bg-warm);
      border-radius: var(--radius-lg);
      padding: 2rem;
      transition: var(--transition);
      position: relative;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-card);
    }

    .bento-card.dark {
      background: var(--primary-dark);
      color: white;
      border: 1px solid #333;
    }

    .bento-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .bento-card.wide {
      grid-column: span 2;
    }

    .bento-card.tall {
      grid-row: span 2;
    }

    .card-icon {
      font-size: 2rem;
      color: var(--accent-gold);
      margin-bottom: 1rem;
    }

    .bento-card h3 {
      font-size: 1.5rem;
      margin-bottom: 0.6rem;
    }

    .bento-card p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    .dark p {
      color: #aaa;
    }

    @media (max-width: 768px) {
      .bento-grid {
        grid-template-columns: 1fr;
        grid-auto-rows: auto;
      }
      .bento-card.wide, .bento-card.tall {
        grid-column: span 1;
        grid-row: span 1;
      }
    }

    /* ----- 场景展示 ----- */
    #scenarios {
      background: #1A1A1A;
      padding: 100px 0;
      color: white;
      text-align: center;
    }

    .device-showcase {
      display: flex;
      justify-content: center;
      gap: 2rem;
      flex-wrap: wrap;
      margin-top: 3rem;
    }

    .device-card {
      background: rgba(255,255,255,0.05);
      border-radius: 20px;
      padding: 1.5rem;
      backdrop-filter: blur(4px);
      max-width: 280px;
    }

    /* ----- 数据面板 ----- */
    #stats {
      padding: 100px 0;
      background: var(--bg-warm);
    }

    .counter-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 2rem;
    }

    .counter-item .number {
      font-family: 'DIN Alternate', 'Inter', sans-serif;
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent-red);
    }

    /* ----- FAQ 手风琴 ----- */
    #faq {
      padding: 100px 0;
    }

    .faq-layout {
      display: flex;
      gap: 3rem;
    }

    .faq-categories {
      flex: 0 0 200px;
    }

    .faq-categories button {
      display: block;
      width: 100%;
      background: none;
      border: none;
      text-align: left;
      padding: 0.8rem 1rem;
      font-weight: 500;
      color: var(--text-body);
      cursor: pointer;
      border-left: 3px solid transparent;
      transition: 0.2s;
    }

    .faq-categories button.active {
      border-left-color: var(--accent-red);
      background: #FDFBF7;
      color: var(--accent-red);
    }

    .accordion-item {
      border-bottom: 1px solid #e0e0e0;
    }

    .accordion-title {
      padding: 1.2rem 0;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
    }

    .accordion-item.active .accordion-content {
      max-height: 200px;
      padding-bottom: 1rem;
    }

    /* 页脚 */
    #cta-footer {
      background: #111;
      color: #ccc;
      padding: 4rem 0 2rem;
      text-align: center;
    }

    .footer-logo {
      font-family: var(--font-serif);
      font-size: 1.8rem;
      color: white;
      margin-bottom: 1rem;
    }

    /* 响应式调整 */
    @media (max-width: 520px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .faq-layout {
        flex-direction: column;
      }
    }